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Knowledgebase

Matrix

CryptPad

Lemmy

Mastodon (4d2.social)

Email

Calendaring Tools

Vaultwarden (Bitwarden compatible)

4d2.org BBS

Link Shortener (4d2.link)

File Sharing (depot.4d2.org)

PeerTube (video.4d2.org)

Jitsi Conferencing

Security & Privacy

Terms of Service

Company Info & Policies

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Getting started with Matrix

Category: Matrix

Here's how to get started on the 4d2 dot org Matrix homeserver. Signing Up for an Account To sign up for a free Matrix account, go to our Element instance and click the option to register. You must us...

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How do I get a 4d2.org email account?

Category: Email

4d2.org email accounts are available to anyone who would like private email for personal, non-commercial purposes. Bulk sending, sending mail using scripts and spamming are not allowed. To request an ...

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How do I report a problem Matrix user?

Category: Matrix

If the user is on another Matrix server, or is merely being obnoxious to you, your best option is simply to block or ignore that user. You can also use the report button in your Matrix client to bring...

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Why is it called 4d2.org? Does it mean/stand for something?

Category: Company Info & Policies

It's mostly just a short domain name that we thought was cute and relatively easy to spell, with a sideways reference to the number 42. When Sarah registered 4d2.org back in 2001 for a personal hostin...

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What limits apply to the Matrix service?

Category: Matrix

Note: This article discusses technical limits, like file size limits, data retention periods, and rate limits. If you're looking for information about what is and isn't allowed on our Matrix server, p...

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What Matrix bridges are available?

Category: Matrix

Matrix supports bridging messages between Matrix rooms and third-party messaging platforms. A complete list of bridges that we host and support is in our Matrix Quick Start Guide. It's important to re...

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What limits apply to 4d2.org email accounts?

Category: Email

Content and Use Limitations Email accounts are for personal, non-commercial use only, and use of automated systems (including scripts) to send email is not allowed without prior approval by the admin ...

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I get an error when accessing depot. Chrome gives a security error / I see PR_END_OF_FILE_ERROR using Firefox.

Category: File Sharing (depot.4d2.org)

If your connection to depot is timing out, check our service status and scheduled maintenance windows on our homepage. It's possible that depot is undergoing maintenance, or that there's a problem on ...

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Please remove my information / I'd like to be "forgotten."

Category: Security & Privacy

In general, we only collect the personal information that we absolutely need to provide our services. This includes information that you actively provide, like usernames and email addresses, as well a...

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I can't register on website XYZ using my 4d2.org email - it says it's invalid.

Category: Email

Does it say your address is invalid the moment you click the submit button on the registration form, or even while you're still filling out the form? If so, this is almost always the fault of the webs...

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How can I help support 4d2.org?

Category: Company Info & Policies

The quickest and easiest way to support us to donate to help offset our costs. As of early 2026, our parent organization, All Computers Are Brilliant Inc., operates at a loss each month, and our direc...

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Can you read my email?

Category: Email

Unless you encrypt it using a tool like gpg, yes. Email is an inherently insecure platform. Mail is stored on the server as plain text, and exchanged with other servers in plain text. All staff are pr...

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